Method for Checking the Production Quality of an Optical Security Feature of a Value Document

A method for checking the production quality of a prescribed optical security feature in or on a prescribed portion of a value document on the basis of pixel data of pixels of an image of the prescribed portion which are respectively associated with places in or on the portion and render optical properties of the value document at the places, wherein it is checked whether a first number of those pixels, or a first share of those pixels in the pixels of the image, whose pixel data, according to a first prescribed criterion, lie within a first reference region prescribed for the security feature exceeds a first minimum hit value prescribed for the security feature, and whether a first scatter of the pixel data of those pixels lying within the first reference region for the pixel data according to the first criterion exceeds a first minimum scatter prescribed for the security feature,

• and there is formed in dependence on the result of the check a quality signal which represents an indication of a sufficient production quality only when the first number or first share exceeds the first minimum hit value, and the first minimum scatter, and/or which represents an indication of a production fault, when the first number or first share does not exceed the first minimum hit value, and the scatter the first minimum scatter.

The method according to claim 47, wherein for a value document, for which the quality signal for one of the value documents represents no indication of a sufficient production quality, the pixel data and/or data ascertained upon the check are so stored in a storage device, that they can also be accessed after the end of the check of the value documents.